Improvement in microscopes



UNITED STATES PATENT OEEICE.A

J. J. BAUSGH, OF ROCHESTER, NEW YORK, ASSIGNOR. TO BAUSOH & LOMB,

OF SAME PLACE.

IMPROVEMENT IN MICROSCOPES.

Specification forming part ot Letters Patent No. 47,382. dated April 25,1865.

,condition t'or examining an object; Fig. 2, a

c ulti-al vertical section in the same position; Fig. 3, a similarsection, but with the microsrope shut or closed togetherin the conditionfor carrying in the pocket; Fig. 4, a plan of. the eye-piece of themicroscope; Fig. 5, aplan of the object-piece.

Like letters of reference indicate correspondingparts in all theiigures.

It is the object ot' my improvement to produce asimple microscope forordinary use that l is capable ot' being closed or shut into compactfosm, so as to be carried in the pocket; and my invention consists in`the combination ot' a1 object or base piece, an eye-piece, and a sgring, so arranged th at the reaction or extens'ton ot' the spring willseparate the eye and object pieces a distance just equal to the focus otthe lens, and so arranged that when closed the eye-piece shuts withinthe object piece, aid holds there by means of small lips or tl tnges onthe former, that enter corresponding notches or depressions ofthelatter.

As represented in the drawings, A is the f object or base piece of themicroscope, having a central opening, a, for viewing the object; B, theeye-piece, having an ordinary lens, b, and O a spinal spring connectingthe two, being preferably of conical shape, so that when compressed itwill easily shut into the object-piece, as clearly represented in Fig.`3.` The object-piece A is made hollow or ot' dish torni, and isprovided at the top with a projecting horizontal rim c, Figs. 3 and 5,in

which, at suitable positions, are made two or more notches, d d,substantially of the shape shown. At corresponding positions theeyepiece B is also provided with projecting lips or anges ff, so thatwhen the eye and object pieces are brought together the lipsff willenter the notches d d, then a slight turning movement of the eye-piece(which the spring allows) brings the jian ges under the rim c, and

the two parts hold securely together.

The advantages of this arrangement are,ti1st,`

that the device can be compressed into a veiy compact form, so as to becarried in the pocket easily, occupying scarely more space than an lordinary-sized button, and it is in the most convenient shape, therebeing no projecting parts; second, when opened, the focus is exactlyadjusted, as the reaction ot' the spring is just the focus of thel ens,thereby saving an adjustment that is required in all ordinarymicroscopes. It' the spring is made ot' good brass wire, this focuswillremain very accurate.

What I claim as myinvention, and desire to secure by Letters Patent, is-

The combination of the object-piece A, eyepiece B, and spring C,substantially as and for the purpose herein set forth.

In witness whereof I have hereunto signed my name in the presence ot'two subscribing J. J.; sAUsoI-r.

witnesses.

